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I have classes A and B.
Can I put these classes in the same NSMutableArray without problems in future?
Example:
NSMutableArray *maincoll = [[NSMutableArray alloc] init];
ClassA *ca = [[classA alloc] init];
ClassB *cb = [[classB alloc] init];
//here is case
[maincoll addObject:ca];
[maincoll addObject:cb];
...
Yes. No limitations. The only thing you have to be careful of is when you retrieve items from the array to verify their class (if necessary) before starting to use them.